THE MICROWAVE SPECTRUM AND STRUCTURE OF SULFINE $(CH_{2}SO)$

Abstract

The microwave spectrum of the reactive species su1fine $(CH_{2}SO)$ has been studied. Assignments of 86 transitions of the ground vibrationa1 state normal isotopic species, with J up to 60, have allowed a thorough centrifugal distortion analysis. With planarity implied by the $I_{c} -I_{a} -I_{b}$value of 0.1333 amu{\AA}$^{2}$, spectral assignments of seven other isotopic modifications have resulted in the following substitution bond lengths and angles: $C-H_{syn} = 1.085$ {\AA}, $C-H_{anti} = 1.077$ {\AA}, $C-S = 1.610$ {\AA}, $S-0 = 1.469$ {\AA}, $\angle HCH = 121,86^\circ, \angle SCH_{syn} = 122.51^\circ, \angle SCH_{anti} = 115,63^\circ,$ and $\angle CSO = 114.72 ^\circ$. From Stark effect measurements of the normal and $d_{2}$ species, the dipole moment has been determined to be 2.994 D, oriented $25.50^\circ$ relative to the S-0 bond and $9-61^\circ$ relative to the normal species ""a"" axis. At an initial pressure of 30 mTorr in a clean brass waveguide, the lifetime of sulfine at $25^\circ C$ is ~30 min.